JPH11223398A - Heat exchanger for heat engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase contact area, and to improve heat exchange providing the head of a cylinder facing a space where heat is generated in the cylinder, and a channel for a heat exchange medium passing through the head. SOLUTION: A cold head 25 is installed at the top part of an expansion cylinder 7. The cold head 25 seals the expansion cylinder 7, demarcates an expansion chamber 9, is manufactured integrally by a member such as aluminum, combines an upper part 26 with a lower part 27, and constitutes a channel 28 for a heat exchange medium with a square section being surrounded by a base surface 28a passing in a horizontal direction, both side surfaces, and a ceiling surface 28c. Then, an inflow hole 29 and outflow hole 30 are formed at the channel 28 for the heat exchange medium, so that they are connected to the channel 28 for the heat exchange medium, thus increasing contact area, effectively achieving heat exchange, and hence improving heat exchange.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for a heat engine such as a Stirling cycle machine, a Vilmier cycle machine, a Kuku-Javlov cycle machine, etc., for example, a heat exchanger for extracting cold heat from a Stirling cycle refrigerator or the like. .

[0002]

2. Description of the Related Art Conventionally, Stirling cycle equipment,
Vilmier cycle devices, Kuku-Yarborov cycle devices, and the like are known in JP-A-6-281276, JP-A-9-152210, JP-A-8-158939, and the like.

In FIG. 1, reference numeral 1 denotes a conventional Stirling refrigerator which is an example of a Stirling cycle device.
A compression piston 5 is provided reciprocally within the high-temperature inner cylinder 3 of the high-temperature cylinder 2 so as to form a compression space 4, and a radiator 6 for removing compression heat is mounted outside the high-temperature cylinder 2. ing.

The expansion inner cylinder 8 of the expansion cylinder 7
Inside, an expansion piston 10 is provided so as to be able to reciprocate so as to form an expansion space (freezing generation section) 9, and a cold head (freezing removal section) 1 surrounds the expansion space 9.
1 is provided. A regenerator 12 is provided outside the inner cylinder 8 of the expansion cylinder 7, and a radiator 13 is attached to the outer side of the expansion cylinder 7 below the regenerator 12.

The compression space 4 and the expansion space 9 are formed by a flow path 14 formed by the high-temperature cylinder 2 and the high-temperature inner cylinder 3,
The communication path 15, the flow path 16 formed by the expansion cylinder 7 and the expansion inner cylinder 8, and the cooler 12 are sequentially connected to each other.

[0006] A crank mechanism 18 is provided in the crank chamber 17.
The compression piston 5 and the expansion piston 10 are connected to base ends of the compression piston 5 and the expansion piston 10 via the pistons 9 and 20 and the piston rods 21 and 22.
A piston seal 23 that shields the crank chamber 17 and the compression space 4 and a piston seal 24 that shields the crank chamber 17 and the expansion space (freezing generation section) 9 are mounted on these base ends. To prevent the oil in the crank chamber 17 from entering the hot inner cylinder 3 and the expanded inner cylinder 8,
Oil rod seals 21 'and 22' are provided. In the case of oil-free, such an oil seal is unnecessary.

When the clamping mechanism 18 is driven by driving means (not shown) such as an electric motor, the compression piston 5 in the high-temperature cylinder 2 moves to the compression space 4 side, and the working gas such as helium and nitrogen in the compression space 4 is moved. (Primary refrigerant).
The compressed working gas is radiated by the radiator 6 when passing through the flow path 14, is cooled to around room temperature, flows into the regenerator 12 through the flow path 15, and is cooled.

Thereafter, the expansion piston 10 in the expansion cylinder 7 descends with a phase difference of about 90 degrees from the pressure piston 5. As a result, the expansion space (freezing generation section) 9 expands, and the low-temperature working gas from the animal cooler 12 flows into the expansion space (freezing generation section) 9 and rapidly expands, so that the pressure drops sharply and the expansion space expands. (Freezing generation part) The inside of 9 is further cooled. This low-temperature working gas cools a heat exchange medium (secondary refrigerant) such as air in contact with the cold head (freezing and removing section) 11, and sets a cold heat utilization section such as a freezer to a freezing temperature.

The cold head (refrigeration take-out section) 11 of such a Stirling refrigerator has a smooth outer surface in contact with the heat exchange medium as shown in FIG. 1, or a cooling fin formed on the outer surface. In any case, there is a problem that the area in contact with the heat exchange medium is not sufficient, and the cold generated in the expansion space (refrigeration generating section) 9 cannot be efficiently taken out to the external heat exchange medium, and the refrigerating capacity is reduced. Was.

[0010]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a cold head (refrigeration take-out section) such as a Stirling refrigerating machine in which a surface in contact with a heat exchange medium (secondary refrigerant) is increased. It is also possible to increase the flow velocity of the medium, and to efficiently extract the cold heat of the working gas at the refrigeration temperature generated in the expansion space (refrigeration generating section) 11 to an external heat exchange medium, thereby improving the refrigeration capacity. It is an object of the present invention to provide a heat exchanger applied to

Further, by focusing on offset strip fins having excellent heat transfer performance and applying them to a cold head (refrigeration take-out part), heat processing is excellent, cost is low, and heat exchange performance is excellent. To provide an exchange.

[0012]

In order to solve the above-mentioned problems, the present invention provides a heat exchanger for a heat engine for exchanging heat generated in a cylinder of the heat engine to a heat exchange medium outside the heat engine. A heat exchanger for a heat engine, comprising: a head of the cylinder facing a space that generates heat in the cylinder; and a heat exchange medium flow path penetrating the head. provide.

Further, the present invention relates to a heat exchanger for a heat engine for exchanging heat generated in a low temperature side cylinder of a heat engine to a heat exchange medium outside the heat engine. A heat exchanger for a heat engine, comprising: a cold head of the cylinder facing a space where a space is generated; and a flow path for a heat exchange medium passing through the cold head.

Further, according to the present invention, the heat exchange medium flow path is
A heat exchanger for a heat engine, wherein the heat exchanger is formed so as to penetrate in a direction perpendicular to the longitudinal direction of a cylinder of the heat engine.

Further, there is provided a heat exchanger for a heat engine, wherein the heat exchange medium flow path is formed so as to penetrate in a direction perpendicular to a long axis direction of a low temperature side cylinder of the heat engine. .

Further, the present invention provides a heat exchanger for a heat engine, wherein offset strip fins are provided in the heat exchange medium flow path.

The heat exchanger is applied to a heat exchanger of a heat engine such as a Stirling cycle device, a Vilmier cycle device, and a Kuku-Yarlov cycle device.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described based on embodiments with reference to the drawings. FIGS. 2 and 3 show a first embodiment of the heat exchanger of the present invention, and have a configuration applied to a cold head of a Stirling refrigerator. The overall configuration of the Stirling refrigerator itself is the same as that of the above-described conventional Stirling refrigerator.

2 and 3, a cold head 25 is attached to the top of the expansion cylinder 7 and seals the expansion cylinder 7 to define the expansion chamber 9 and also serves as a heat exchanger for taking out cold heat. FIG. 2 is a side view thereof, and FIG. 3 is a front view of a state where it is mounted on the top of the expansion cylinder 7. The cold head 25 is integrally manufactured from a member such as aluminum or SUS, and is configured such that an upper portion 26 and a lower portion 27 are combined and fixed.

2 and 3, recesses 26 'and 27' are formed horizontally on the lower surface of the upper portion 26 and the upper surface of the lower portion 27 of the cold head, respectively. Bottom surface 28a, both side surfaces 28
b and a heat exchange medium (secondary refrigerant) flow passage 28 having a rectangular cross section surrounded by the ceiling surface 28c. An inflow hole 29 and an outflow hole 30 are formed so as to communicate with the heat exchange medium flow path 28. A bottom wall 27 'of the heat exchange medium flow path 28 having a certain thickness is formed between the heat exchange medium flow path 28 and the expansion space.

The operation of the first embodiment will be described. The heat exchange medium flowing through the heat exchange medium flow path 28 enters the heat exchange medium flow path 28 through the inlet hole 29, and has a bottom surface 28a and a ceiling surface 28c.
Then, it flows in contact with both side surfaces 28b and flows out of the outflow hole 30 by receiving the cold heat of the cold head. Since the heat exchange medium is in contact with all the walls defining the flow path, the contact area is increased, and more effective heat exchange is achieved.

FIGS. 4 and 5 show a second embodiment of the heat exchanger of the present invention, which is applied to a cold head of a Stirling refrigerator as in the first embodiment. 4 and 5, reference numeral 31 denotes a cold head having substantially the same configuration as that of the first embodiment, in which offset strip fins 32 are disposed in the heat exchange medium flow path 28.

To easily understand the structure of the heat exchanger provided with the offset strip fins 32, FIGS.
A description will be given of an example of a heat exchanger 35 in which an odor offset strip fin 32 is disposed between two inner and outer support plates 33 and 34. Between the inner and outer support plates 33, 34, a long strip (offset strip fin) 36 is bent in a zigzag shape in a rectangular shape to form a partition 37 having a rectangular cross section. It is brazed so that a plurality of strips 36 are formed in the longitudinal direction. Such a long strip 36,
A plurality of continuous passages 37, 37 formed by the long strips 36, 36 adjacent to each other in a direction perpendicular to the longitudinal direction thereof, are arranged offset from each other (in an offset state).

In the cold head 31 in which the offset strip fins 32 having such a configuration are applied to the heat exchange medium flow path, the direction of the partition path 37 of the offset strip fins 32 is the traveling direction of the heat exchange medium flow path 28. Is brazed on the bottom surface 28a so that

The operation of the second embodiment will be described. The heat exchange medium flows into the heat exchange medium flow path 28 through the inflow hole 29, flows through the heat exchange medium flow path 28 while contacting the offset strip fins 32, and flows out of the outflow hole 29.
When the heat exchange medium flows through the heat exchange medium flow path 28, the offset strip fins 32 come into large area contact, so that the heat exchange performance is improved and the refrigerating capacity of the refrigerator is improved.

In the first embodiment, the top of the expansion space is formed in a dome shape. However, the flow path for the heat exchange medium is curved in the cold head along the dome-shaped top surface. If it penetrates and the thickness of the bottom wall is made substantially constant, more efficient heat exchange can be performed.

Similarly, also in the second embodiment, the top of the expansion space is curved along the dome-shaped top surface, and the heat exchange medium flow path is curved such that the bottom wall has a substantially constant thickness. If the offset strip fins are arranged along the heat exchange medium flow path, more efficient heat exchange can be performed.

The above-described embodiment is an example in which the heat exchanger of the present invention is applied to a cold head of a Stirling refrigerator. In addition, heat is generated in a Vilmier cycle device, a Kuku-Yarborov cycle device, and the like. It goes without saying that the heat exchanger of the present invention can be applied to a cylinder.

[0029]

In the heat exchanger of the present invention, the heat exchange medium flow path is formed through the cylinder head and the cold head. Because it touches all surfaces that define the path, the contact area is increased and more effective heat exchange is achieved. Further, depending on the shape of the flow path, heat exchange can be improved by increasing the flow rate of the heat exchange medium.

Further, since the offset strip fins are provided along the flow path for the heat exchange medium, the heat exchange medium contacts the offset strip fins when flowing through the flow path, thereby improving the heat exchange performance. Thus, the capacity of the heat engine, for example, the refrigerating capacity of the refrigerator is improved.

In addition, a relatively simple manufacturing process of brazing the offset strip fins and disposing them in the flow path for the heat exchange medium can realize a low-cost heat exchanger having excellent heat exchange performance.

Further, a flow path for the heat exchange medium is penetrated into the cold head in a curved shape along the dome-shaped top surface at the top of the expansion space so that the bottom wall has a substantially constant thickness. If it is formed, more efficient heat exchange is performed along the flow path.

[Brief description of the drawings]

FIG. 1 is a diagram showing a Stirling refrigerator.

FIG. 2 is a side sectional view of a first embodiment of a cold head which is an example of the heat exchanger of the present invention.

FIG. 3 is a front sectional view showing a state where the cold head of FIG. 2 is attached to a low temperature cylinder of a Stirling refrigerator.

FIG. 4 is a side sectional view of a second embodiment of the cold head which is an example of the heat exchanger of the present invention.

FIG. 5 is a front sectional view showing a state where the cold head of FIG. 4 is attached to a low temperature cylinder of a Stirling refrigerator.

FIG. 6 is a perspective view illustrating the offset strip fins of FIGS. 4 and 5;

FIG. 7 is an enlarged view of a main part of the offset strip fin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stirling refrigerator 2 High temperature cylinder 4 Compression space 5 Compression piston 6 Radiator 7 Expansion cylinder 9 Expansion space 10 Expansion piston 11 Cold head 12 Cold storage 15 Communication channel 18 Crank mechanism 25 Cold head 28 Heat exchange medium channel 29 Inflow Hole 30 Outflow hole 31 Cold head 32 Offset strip fin 35 Heat exchanger 36 Elongated strip 37 Section road

Claims (8)

[Claims] 1. A heat exchanger for a heat engine for exchanging heat generated in a cylinder portion of the heat engine with a heat exchange medium outside the heat engine, the heat exchanger facing a space in the cylinder where heat is generated. A heat exchanger for a heat engine, comprising: a head of the cylinder; and a flow path for a heat exchange medium penetrating the head. 2. A heat exchanger for a heat engine for exchanging heat generated in a low temperature side cylinder of a heat engine to a heat exchange medium outside the heat engine, the heat exchanger being provided in a space where the low temperature side cylinder generates cold heat. A heat exchanger for a heat engine, comprising: a cold head of the cylinder facing the heat exchanger; and a heat exchange medium flow path penetrating the cold head. 3. The heat exchanger for a heat engine according to claim 1, wherein the heat exchange medium flow path is formed so as to penetrate in a direction perpendicular to a longitudinal direction of a cylinder of the heat engine. . 4. The heat exchanger for a heat engine according to claim 2, wherein the heat exchange medium flow path is formed so as to penetrate in a direction perpendicular to a long axis direction of a low temperature side cylinder of the heat engine. Exchanger. 5. The heat exchanger for a heat engine according to claim 1, wherein offset strip fins are disposed in the heat exchange medium flow path. 6. The heat exchanger for a heat engine according to claim 1, wherein the heat engine is a Stirling cycle device. 7. The heat exchanger for a heat engine according to claim 1, wherein the heat engine is a Vilmier cycle machine. 8. The heat exchanger for a heat engine according to claim 1, wherein the heat engine is a Kuku-Javlov cycle machine.